Request for exact kernel source/build environment for Jetson Linux 36.4.7 (kernel 5.15.148-tegra) to build external module (pl2303.ko)

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
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Hi NVIDIA Team,

I am working on an NVIDIA Jetson AGX Orin Developer Kit running the following software:

Jetson Linux (L4T): R36.4.7
Ubuntu: 22.04 LTS
Kernel: 5.15.148-tegra

Output of uname -r:

5.15.148-tegra

I need to build an external USB-to-Serial kernel module (pl2303.ko) for this exact kernel version.

I downloaded the public kernel source package for Jetson Linux 36.4.7 and extracted it. However, the top-level Makefile reports:

VERSION = 5
PATCHLEVEL = 15
SUBLEVEL = 185

This does not match the running kernel version:

5.15.148-tegra

Since external kernel modules must be built against the exact kernel source, configuration, and symbol versions, I am unsure whether I have the correct build environment.

Could you please clarify the following?

1.Is the public kernel source package with SUBLEVEL = 185 the correct source for the running kernel 5.15.148-tegra?
2.If yes, why does the kernel source report version 5.15.185 while the running kernel is 5.15.148-tegra?
3.If not, where can I obtain the exact kernel source corresponding to 5.15.148-tegra?
4.How can I obtain the exact .config and Module.symvers used to build this kernel?
5.Are there any NVIDIA-specific patches or recommended steps required to build external modules such as pl2303.ko for Jetson Linux R36.4.7?

My goal is simply to build a compatible pl2303.ko module that can be loaded on the stock Jetson Linux 36.4.7 system.

Any guidance would be greatly appreciated.

Thank you.